** Also affects: neutron/juno
Importance: Undecided
Status: New
** Changed in: neutron/juno
Status: New => Fix Committed
** Changed in: neutron/juno
Milestone: None => 2014.2.3
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https://bugs.launchpad.net/bugs/1421105
Title:
L2 population sometimes failed with multiple neutron-server
Status in OpenStack Neutron (virtual network service):
Fix Released
Status in neutron juno series:
Fix Committed
Bug description:
In my environment with two neutron-server, 'mechanism_drivers' is
openvswitch, l2 population is set.
When I delete a VM which is the network-A last VM in compute node-A, I found
a KeyError in compute node-B openvswitch-agent log, it throws by
'del_fdb_flow':
def del_fdb_flow(self, br, port_info, remote_ip, lvm, ofport):
if port_info == q_const.FLOODING_ENTRY:
lvm.tun_ofports.remove(ofport)
if len(lvm.tun_ofports) > 0:
ofports = _ofport_set_to_str(lvm.tun_ofports)
br.mod_flow(table=constants.FLOOD_TO_TUN,
dl_vlan=lvm.vlan,
actions="strip_vlan,set_tunnel:%s,output:%s" %
(lvm.segmentation_id, ofports))
the reason is that openvswitch-agent receives two RPC request
'fdb_remove', why it receives twice, I think the reason is that:
there are two neutron-server: neutron-serverA, neutron-serverB, one compute
node-A
1. nova delete VM which is in compute node-A, it will firstly delete the TAP
device, then the ovs scans the port is deleted, it send RPC request
'update_device_down' to neutron-serverA, when neutron-serverA receive this
request, l2 population will firstly send 'fdb_remove'
2. after nova delete the TAP device, it send REST API request 'delete_port'
to neutron-serveB, the l2 population send second 'fdb_remove' RPC request
when ovs agent receive the second 'fdb_remove', it del_fdb_flow, the
'lvm.tun_ofports.remove(ofport)' throw KeyError, because
the ofport is deleted in first request
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